Knowledge Builders

do electric tankless water heaters need to be flushed

by Kelsie Ward III Published 2 years ago Updated 2 years ago
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Both gas and electric tankless water heaters need to be flushed regularly, however it's important to note that the procedures are entirely different.

How to flush a tankless water heater the easy way?

Steps for Performing a Water Heater Cleanout/Flush

  • Shut Off Gas. Just like any other appliance in your home, your heater will have some power being supplied to it for operation.
  • Open a Hot Water Faucet. ...
  • Turn Off the Cold Water Valve. ...
  • Connect a Hose to the Heater. ...
  • Water Heater Flush for Sediment: Drain the Tank. ...
  • Flush the System. ...
  • Reactivate Power and Gas. ...

How often should I Flush my tankless water heater?

The frequency of the water heater flushing service depends on a few key factors, including:

  • Amount of sediment in your water source
  • Number of people in your home
  • Frequency of hot water usage

Why it is crucial to clean your tankless water heater?

Tankless Water Heater: Unlike tank-style water heaters, tankless water heaters don’t store water in tanks. Instead, they use a heat exchanger to heat the water rapidly as it passes through the unit. The heat is provided only when needed, so there are no standby energy losses with a storage tank.

Do you really need a tankless water heater?

This is quite a common question, especially for bigger houses. In most cases, you need only 1 tankless heater for an entire house. However, if you really have a big house (2+ bathrooms), even the big 11 GPM Rinnai gas tankless water heater will not be enough to satisfy all your simultaneous hot water needs.

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How do you flush an electric tankless hot water heater?

1:185:39How To Clean & Flush Tankless Hot Water Heaters with VINEGAR!YouTubeStart of suggested clipEnd of suggested clipYou can start with the blue valve. And you'll see that just a little bit of water comes out but whenMoreYou can start with the blue valve. And you'll see that just a little bit of water comes out but when you go over the red valve.

What happens if you don't flush your tankless water heater?

What happens if I don't flush out my tankless water heater? Mineral deposits may build up. This could cause a clog within the unit and may prevent normal heating activity. Your hot water could also fluctuate and overheat the system, impacting its efficiency.

How much does it cost to flush a tankless water heater?

It costs around $150 to flush a tankless water heater. You especially need it at least annually if you have well water with a lot of iron. That causes more sediment buildup. The process takes about a half-hour.

Do all tankless water heaters need to be flushed?

Unlike tank-style units that could go several years between maintenance, tankless water heaters should be flushed once a year. “The frequency is typically annual, unless the water quality is poor, in which case it's recommended more frequently,” Federico says.

How long should you flush a tankless water heater?

Flushing your tankless heater is a simple task, but it does take 1-2 hours to complete. For most water quality, completing this task once a year will suffice, but if you have especially hard water you may want to complete more often.

What maintenance do tankless water heaters require?

The good news is that tankless water heaters don't require much maintenance, either. A tankless system should be serviced as a part of the regular preventive maintenance that heating and cooling systems receive. Electric or gas components should be inspected.

How do I know if my water heater needs to be flushed?

3 Signs it is Time to Drain your Water Heater#1. Your water isn't as hot as it should be. If you are getting lukewarm water, the problem could be lime buildup around your heating elements. ... #2. You've noticed sludge in your water. ... #3. It's been more than 12 months since you last drained it.

What is the most common problems with tankless water heaters?

Most Common Problems With Tankless Water HeatersOverload. Every tankless water heater has a flow rate capacity that should give you a good idea of how much hot water can be used simultaneously. ... Cold Water Sandwich Effect. ... Mineral or Sediment Buildup. ... Flame or Ignition Failure.

Do tankless water heaters need yearly maintenance?

Annual or semi-annual maintenance is important for a tankless water heater, but it won't make the system last forever. Eventually you will need to replace the appliance with a new one, though a tankless system may last more than 20 years.

How often should tankless water heaters be serviced?

once per yearJust like a tank unit, tankless water heaters need to be flushed once per year. Homeowners with hard water should consider flushing and cleaning the unit even more frequently, perhaps every six to nine months because of the excess amounts of magnesium and calcium found in hard water supplies.

How do you flush a Rheem electric tankless water heater?

0:0016:01Tankless Water Heater Lime and Scale Flushing Procedure - YouTubeYouTubeStart of suggested clipEnd of suggested clipTurn the hot water valve off. Put your clean submersible utility pump in your clean five-gallonMoreTurn the hot water valve off. Put your clean submersible utility pump in your clean five-gallon bucket half the stress that everything needs to be clean and sanitary.

Do tankless water heaters require annual maintenance?

Tankless Water Heater Maintenance Most of the country has “hard” or “very hard” water, which may require you to have your tankless water heater flushed as often as once a year. You may need less frequent maintenance if your hot water usage is low or you have a water softener.

How do you unclog a tankless water heater?

0:558:04Tankless Water Heater DeScaling - How To Flush - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo you don't have any problems it's a pretty simple procedure what we're going to do is we're goingMoreSo you don't have any problems it's a pretty simple procedure what we're going to do is we're going to flush white vinegar. Through this boiler inside of this tankless water heater.

Why flush a tankless water heater?

The Importance of Flushing Tankless Models. Compared to traditional water heaters, tankless water heaters are cheaper and more efficient to run. They also require far less maintenance or space to operate. That’s why it’s important to know first why and when it’s needed, then how to flush a tankless water heater, be it gas or electric.

How to clean a water heater with vinegar?

Open the hot and cold service ports and turn the pump on. Allow the vinegar to circulate through the heater for a minimum of one hour (longer if the pump runs at less than four gallons per minute). This breaks down the scale and flushes out the sediment. Turn the pump off and dump the vinegar.

How to flush out vinegar from a water pump?

Turn the pump off and dump the vinegar. Close the cold water service port and remove the attached hose. Open the cold water shut-off valve to flush out any remaining vinegar through the second hose into your bucket for about ten minutes. Close the cold water shut-off valve.

How to release hot water pressure?

Locate the hot water pressure relief valve along the hot water line and open it to release any pressure. Be careful, as the hot water will be hot. There will be both a cold water service port and hot water service port. Connect hoses to both of these ports. Place your submersible pump into a five-gallon bucket .

Can tankless heaters cause lime scale?

Tankless heaters are no exception. Hard water contains minerals which can lead to lime scale build-up. Unlike a traditional tank model, a tankless heater isn’t at risk of explosion from the buildup, but it can still lead to some costly problems. The heat exchanger is especially sensitive to scale.

Why is it important to flush a tankless water heater?

If you don't flush the water heater , the heat exchanger can be damaged as not enough water will pass through and cool it down. Any damage which is related to lime scale build-up is not covered by ...

Why is it dangerous to clean a tankless water heater?

Due to the hard water, especially from the well, the heater might develop lime and mineral deposits on heater's elements. Sediment build-up is especially dangerous in narrow water passages as it might clog the element and prevent further normal heating operation.

How long does it take to clean a water heater?

Rinse the cleaning solution from the water heater by opening the shutoff valve on the cold water line (close the service valve between the pump and the heater) so it runs through the heater and into the bucket (approximately 5 mins.)

What is tankless water heater?

A tankless hot water heater is also called an on-demand water heater or an instant hot water heater. They instantly heat water as it flows through the device without the use of a storage tank.

How much energy does a tankless water heater save?

Tankless water heaters will save you money in the long run. The base price for a tankless water heater may be more than a traditional hot water tank, however, they can be up to 34% more energy efficient than the standard hot water tank and can last more than twice the life.

How hard is water in Monroe County?

Water hardness is a measure of the mineral content of water. In Monroe County, the water is considered to be moderately hard. It contains between 5.6 and 7.6 grains per gallon of hard water. Homeowners living in Rochester, NY or Monroe County do not need a water softener, however getting your tankless water heater flushed out with ...

What does it mean to winterize a tankless water heater?

Winterizing a tankless water heater means preparing it for the cold weather. Most manufacturers do not cover damage caused by freezing under their warranties, so they may need a little extra care during the chilly season.

What happens if a water heater valve fails?

If the valve fails, there could be flooding, leaking, tank rupture, noise, and dirt build up. In this case, your valve would need to be repaired or replaced.

Is a gas water heater good for a large family?

Gas units are designed to burn natural gas or propane and most manufacturers offer a natural gas model and a propane model. Gas water heaters could be beneficial for large families with high hot water needs . However, these units are higher maintenance and are less energy efficient.

Can you choose between gas and electric water heaters?

This is one of the most common questions regarding water heaters. Sometimes, people do not have a choice between gas and electric. However, if you do get to choose, there are some things to consider.

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